- REPORTS ON INVESTIGATIONS AND PROJECTS. 



of the vortex structure, classified as unipolar, bipolar, or multipolar; (6) 

 b igh tZ structure about spots; (c) eruptions; («) filaments, and the ange 

 ftey make with the equator; (e) angle between the axis of the multipolar 



^ch" Sr of the ffi flocculi and the discovery that the two 

 larger snots lying at opposite ends of a group are usually if not always of 

 nnnosite oolarny led to the classification of the H. fioccuh as (l) unipolar 

 7a itle P spo or bright flocculus surrounded by simple vortex structure 

 igh "rand d left-handed, or radial); (a) bipolar (spot group or two 

 Ss-one sometimes absent or replaced by bright flocculus-surrounded 

 ITL flo cuh resembling in form the lines of force -necttng the opposite 

 poles of a bar magnet) ; (3) multipolar (spot group grounded b curved 

 Ha flocculi of special form) ; (4) filaments (very dark, usually long ana 

 noccu " V „ uotions (very bright, rapidly changing in form). This 



education ISui sometbdivisions wni include most of the more character- 



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S^r^XS" d^nlai^d with or without Aistu = in 



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Sola ™e he bright flocculi are usually seen first between the spots, 

 the bipolar typ the b g ^^ ^ ^ ^ of group 



Thiffivot thltypoSis led upon observation of the magnetic phenom- 

 ^a *" theto principal'spots of a bipolar group are the opposite extremi- 



'^e SSrst^ure on which the above system of classification is 



^phftne ™ip H o,t Ld bipolar typ'e cau be distinguished in .ome cases but 

 no good example of the multipolar type has been found as yet. The general 



1,1 Th'e' Caxis of multipolar flocculi has been found, in 38 «*»£££ 

 nearly parallel to the solar equator and to coincide very nearly with the axis 

 of the inclosed spot groups. 



